Your drivers doesn't work, it will power off the monitor after boot, but thanks anyway :(
Ive got an idea to install that 2900XT drivers, than i repaired permissions and then i reboot with -f. Not the same problem, it will gets me to the blue screen with the mouse, but the normal mac isn`t loaded... I think i am closer to conclusion... have any1 ideas?

btw.: how i can update my system to 10.5.3? I don`t know how...

Nobody knows? :(